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[NTOS:EX] Use InterlockedExchangeAdd64 instead of InterlockedCompareExchange64 loop in ExAllocateLocallyUniqueId

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This commit is contained in:
Timo Kreuzer
2018-07-12 15:54:52 +02:00
parent 21c9f2a488
commit fffe4f6385
1 changed files with 2 additions and 20 deletions
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22
ntoskrnl/ex/uuid.c
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@@ -339,27 +339,9 @@ VOID
NTAPI
ExAllocateLocallyUniqueId(OUT LUID *LocallyUniqueId)
{
LARGE_INTEGER PrevLuid;
LONGLONG NewLuid, CompLuid;
/* Atomically increment the luid */
PrevLuid.QuadPart = ExpLuid.QuadPart;
for (NewLuid = ExpLuid.QuadPart + ExpLuidIncrement; ;
NewLuid = PrevLuid.QuadPart + ExpLuidIncrement)
{
CompLuid = InterlockedCompareExchange64(&ExpLuid.QuadPart,
NewLuid,
PrevLuid.QuadPart);
if (CompLuid == PrevLuid.QuadPart)
{
break;
}
PrevLuid.QuadPart = CompLuid;
}
LocallyUniqueId->LowPart = PrevLuid.LowPart;
LocallyUniqueId->HighPart = PrevLuid.HighPart;
*(LONG64*)LocallyUniqueId = InterlockedExchangeAdd64(&ExpLuid.QuadPart,
ExpLuidIncrement);
}